JP2009218061A - Optical unit for vehicle headlight - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical unit for a vehicle headlight can make light intensity of a prescribed region within a prescribed light distribution pattern formed by superimposing an additional light distribution pattern formed by one of the reflecting surfaces on a basic light distribution pattern formed by the other lower than light intensity around the prescribed region. <P>SOLUTION: In the optical unit for a vehicle headlight equipped with a condensing lens, an LED light source, a first reflecting surface forming a basic light distribution pattern by reflecting light from the LED light source and making it transmit the condensing lens to illuminate it forward, and a second reflecting surface forming an additional light distribution pattern to be superimposed on the basic light distribution pattern by further reflecting reflected light from the first reflecting surface and making it transmit the condensing lens to illuminate it forward, a concave part is formed in a region out of the second reflecting face where the reflected light from the first reflecting surface is reflected toward a prescribed region in the additional light distribution pattern, and a third reflecting surface reflecting the reflected light incident into the concave part from the first reflecting surface is provided inside the latter. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical unit for vehicle headlamps, and more particularly to an optical unit for vehicle headlamps that can reduce the luminous intensity of a predetermined area in a predetermined light distribution pattern to be lower than the luminous intensity around the predetermined area.

  Conventionally, in the field of vehicular lamps, two reflecting surfaces are used, light from an LED light source is reflected by one reflecting surface, and the above-mentioned one reflecting the other reflecting surface is formed into a basic light distribution pattern formed by the reflected light. There is known a vehicular lamp that forms a predetermined light distribution pattern by further reflecting reflected light from the reflection surface of the light and superimposing an additional light distribution pattern formed by the reflected light (for example, Patent Document 1).

  FIG. 7 is a side view for explaining the vehicular lamp described in Patent Document 1. FIG.

  As shown in FIG. 7, the vehicular lamp described in Patent Document 1 is arranged so as to cover the LED light source 20 ′ in front of the projection lens 10 ′, the LED light source 20 ′, and the LED light source 20 ′ in the light source main optical axis direction. The first reflective surface 30 ′, the shade 40 ′ disposed in a horizontal posture between the projection lens 10 ′ and the LED light source 20 ′, the second reflective surface 50 ′ formed on the upper surface of the shade 40 ′, and the like.

  In the vehicular lamp described in Patent Document 1, reflected light from the LED light source 20 ′ is reflected by the first reflecting surface 30 ′ and transmitted through the projection lens 10 ′ to form a basic light distribution pattern, and second reflected The surface 50 'reflects the reflected light from the first reflecting surface 30', transmits the projection lens 10 ', and forms an additional light distribution pattern superimposed on the basic light distribution pattern.

Generally, in the light distribution pattern formed by the vehicle headlamp, the highest light intensity is required in the area near the pedestrian side light and dark boundary line, and the road surface reflection in rainy weather is required in the area on the oncoming vehicle side. Therefore, a relatively low luminous intensity is required. FIG. 8 is a diagram for explaining a region where a low luminous intensity is required in the light distribution pattern.
JP 2003-317513 A

  However, in the vehicular lamp described in Patent Document 1, the reflected light from the second reflecting surface 50 ′ is also applied to the area on the oncoming vehicle side where relatively low light intensity is required. For this reason, there exists a problem that it is very difficult to reduce the luminous intensity of the area | region on the said oncoming vehicle side.

  The present invention has been made in view of such circumstances, and is formed by superimposing an additional light distribution pattern formed by the other reflection surface on a basic light distribution pattern formed by one reflection surface. Vehicle headlight capable of lowering the light intensity of a predetermined area in the predetermined light distribution pattern (for example, the area on the oncoming vehicle side where a relatively low light intensity shown in FIG. 8 is required) lower than the light intensity around the predetermined area. It aims at providing the optical unit for lamps.

  In order to solve the above problem, the invention according to claim 1 is a basic light distribution pattern by reflecting light from a condensing lens, an LED light source, and the LED light source, transmitting the condensing lens, and irradiating forward. And an additional light distribution pattern that is superimposed on the basic light distribution pattern by further reflecting the reflected light from the first reflective surface, transmitting the condensing lens, and irradiating forward. In the vehicle headlamp optical unit including the second reflecting surface to be formed, the reflected light from the first reflecting surface of the second reflecting surface is reflected toward a predetermined region in the additional light distribution pattern. A concave portion is formed in the region, and a third reflective surface that reflects reflected light from the first reflective surface that enters the concave portion is provided in the concave portion.

  According to the first aspect of the present invention, the reflected light from the first reflecting surface incident on the recessed portion is added to the additional light distribution by the third reflecting surface provided in the recessed portion formed on the second reflecting surface. It is possible to reflect in a direction other than a predetermined area in the pattern (for example, an area on the oncoming vehicle side where a relatively low light intensity shown in FIG. 8 is required).

  Therefore, according to the first aspect of the present invention, the light intensity of a predetermined area in the additional light distribution pattern (for example, the area on the oncoming vehicle side where a relatively low light intensity shown in FIG. 8 is required) is set to the predetermined area. It becomes possible to lower than the ambient light intensity. That is, according to the first aspect of the present invention, the predetermined light distribution pattern formed by superimposing the additional light distribution pattern formed by the second reflection surface on the basic light distribution pattern formed by the first reflection surface. It is possible to reduce the light intensity in a predetermined area (for example, an area on the oncoming vehicle side where a relatively low light intensity shown in FIG. 8 is required) lower than the light intensity around the predetermined area.

  According to the first aspect of the present invention, the third reflection surface is provided in the recess formed in the second reflection surface and does not protrude from the surface of the second reflection surface. The reflected light from the first reflecting surface for forming the film is not blocked. For this reason, according to the first aspect of the present invention, it is possible to form a basic light distribution pattern having a desired light intensity distribution (without breaking it).

  The invention according to claim 2 is the invention according to claim 1, wherein the third reflecting surface is any one of an inclined plane, an inclined curved surface, and a plurality of uneven surfaces.

  This is an example of the third reflecting surface.

  According to the invention described in claim 2, by using an inclined flat surface or an inclined curved surface as the third reflecting surface, the reflected light from the first reflecting surface incident on the concave portion formed on the second reflecting surface is added. Reflection can be made in a direction other than a predetermined area in the light distribution pattern (for example, an area on the oncoming vehicle side where a relatively low light intensity is required as shown in FIG. 8) (for example, a direction not incident on the condenser lens). It becomes. In addition, by using a plurality of concave and convex surfaces as the third reflective surface, the reflected light from the first reflective surface that enters the recess formed in the second reflective surface is converted into a predetermined region (for example, FIG. 8 can be scattered or diffused in a direction other than the area on the side of the oncoming vehicle where a relatively low light intensity is required.

  Therefore, according to the second aspect of the present invention, the light intensity of the predetermined area in the additional light distribution pattern (for example, the area on the oncoming vehicle side where a relatively low light intensity shown in FIG. 8 is required) is set to the predetermined area. It becomes possible to lower than the ambient light intensity. That is, according to the invention described in claim 2, the predetermined light distribution pattern formed by superimposing the additional light distribution pattern formed by the second reflection surface on the basic light distribution pattern formed by the first reflection surface. It is possible to reduce the light intensity in a predetermined area (for example, an area on the oncoming vehicle side where a relatively low light intensity shown in FIG. 8 is required) lower than the light intensity around the predetermined area.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the first reflective surface has a first focal point set near the LED light source, and a second focal point near the focal point of the condenser lens. The second reflecting surface has an edge positioned in the vicinity of the focal point of the condensing lens, and in a horizontal posture between the condensing lens and the LED light source. It is the planar reflective surface arrange | positioned, It is characterized by the above-mentioned.

  According to the third aspect of the present invention, the second reflecting surface has its end edge positioned near the focal point of the condenser lens, and is disposed in a horizontal posture between the condenser lens and the LED light source. Since it is a plane reflecting surface, it is possible to form a basic light distribution pattern and an additional light distribution pattern having a cutoff line defined by the edge of the shade.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the reflectance of the third reflecting surface is set lower than the reflectance of the second reflecting surface. And

  According to the fourth aspect of the present invention, since the reflectance of the third reflecting surface is set lower than the reflectance of the second reflecting surface, a predetermined region (for example, shown in FIG. 8) in the additional light distribution pattern is set. It is possible to further reduce the light intensity of the oncoming vehicle side where a relatively low light intensity is required, compared to the light intensity around the predetermined area. That is, according to the invention described in claim 4, the predetermined light distribution pattern formed by superimposing the additional light distribution pattern formed by the second reflection surface on the basic light distribution pattern formed by the first reflection surface. It is possible to further reduce the light intensity of the predetermined area (for example, the area on the oncoming vehicle side where a relatively low light intensity shown in FIG. 8 is required) from the light intensity around the predetermined area.

  The invention according to claim 5 is a condensing lens, an LED light source, a first reflecting surface that reflects light from the LED light source, transmits the condensing lens, and irradiates forward to form a basic light distribution pattern; And a vehicle having a second reflecting surface that forms an additional light distribution pattern that is superimposed on the basic light distribution pattern by reflecting the reflected light from the first reflecting surface, transmitting the condensing lens, and irradiating forward. In the lamp, the reflected light from the first reflecting surface is reflected on a region of the second reflecting surface that reflects the reflected light from the first reflecting surface toward a predetermined region in the additional light distribution pattern. An opening for passing through is formed.

  According to the fifth aspect of the present invention, the reflected light from the first reflecting surface that enters the opening formed in the second reflecting surface passes through the opening and is a predetermined region (for example, FIG. No. 8 is a direction other than the area on the side of the oncoming vehicle where a relatively low light intensity is required.

  Therefore, according to the fifth aspect of the present invention, the light intensity of the predetermined area in the additional light distribution pattern (for example, the area on the oncoming vehicle side where a relatively low light intensity shown in FIG. 8 is required) is set to the predetermined area. It becomes possible to lower than the ambient light intensity. That is, according to the fifth aspect of the present invention, the predetermined light distribution pattern formed by superimposing the additional light distribution pattern formed by the second reflection surface on the basic light distribution pattern formed by the first reflection surface. It is possible to reduce the light intensity in a predetermined area (for example, an area on the oncoming vehicle side where a relatively low light intensity shown in FIG. 8 is required) lower than the light intensity around the predetermined area.

  The invention according to claim 6 is a condensing lens, an LED light source, a first reflecting surface that reflects light from the LED light source, transmits the condensing lens, and irradiates forward to form a basic light distribution pattern; And a vehicle having a second reflecting surface that forms an additional light distribution pattern that is superimposed on the basic light distribution pattern by reflecting the reflected light from the first reflecting surface, transmitting the condensing lens, and irradiating forward. In the lamp, in the second reflecting surface, a reflection of light reflected from the first reflecting surface toward a predetermined region in the additional light distribution pattern is lower than a reflectance around the region. It is characterized in that a reflecting surface having a high rate, a scattering reflecting surface or a diffuse reflecting surface is provided.

  According to the sixth aspect of the present invention, the low-reflectance reflection is formed in a region of the second reflecting surface that reflects the reflected light from the first reflecting surface toward a predetermined region in the additional light distribution pattern. Reflected light from the first reflecting surface that is incident on these low-reflectivity reflecting surfaces or the like by the surface, the scattering reflecting surface, or the diffuse reflecting surface is reduced in a predetermined region (for example, the relatively low level shown in FIG. 8). It is possible to reflect in a direction other than the area on the oncoming vehicle side where the luminous intensity is required.

  For this reason, according to the invention described in claim 6, the light intensity of a predetermined area in the additional light distribution pattern (for example, the area on the oncoming vehicle side where a relatively low light intensity shown in FIG. 8 is required) is set to the predetermined area. It becomes possible to lower than the ambient light intensity. That is, according to the invention described in claim 6, the predetermined light distribution pattern formed by superimposing the additional light distribution pattern formed by the second reflection surface on the basic light distribution pattern formed by the first reflection surface. It is possible to reduce the light intensity in a predetermined area (for example, an area on the oncoming vehicle side where a relatively low light intensity shown in FIG. 8 is required) lower than the light intensity around the predetermined area.

  According to the present invention, a predetermined region in a predetermined light distribution pattern formed by superimposing an additional light distribution pattern formed by the other reflection surface on a basic light distribution pattern formed by one reflection surface (for example, FIG. It is possible to provide an optical unit for a vehicle headlamp capable of lowering the light intensity in the area on the side of the oncoming vehicle, which requires a relatively low light intensity shown in FIG. Become.

  Hereinafter, an optical unit for a vehicle headlamp according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view for explaining a main configuration of an optical unit for a vehicle headlamp according to the present embodiment. FIG. 2 is a side view of the vehicle headlamp optical unit shown in FIG.

  The vehicle headlamp optical unit 100 according to the present embodiment is applied to a headlamp such as a headlamp of a vehicle such as an automobile. As shown in FIGS. The light source 20, the LED light source 20, the first reflective surface 30 disposed so as to cover the LED light source 20 from the main optical axis direction of the light source 20, and the shade 40 disposed in a horizontal posture between the condenser lens 10 and the LED light source 20. The second reflection surface 50 provided on the upper surface of the shade 40, the third reflection surface 60 provided in the recess 52 formed in the second reflection surface 50 (shade 40), and the like.

  The condenser lens 10 is an aspherical condenser lens, and has a focal point F on the LED light source 20 side. The condensing lens 10 is arranged in a state in which its optical axis coincides with the lamp optical axis AX.

  The LED light source 20 is, for example, an LED package in which one or a plurality of LED chips of single color or RGB three colors are packaged. As shown in FIG. 2, the LED light source 20 is arranged with its optical axis facing upward and tilted at a predetermined angle rearward of the vehicle.

  The first reflecting surface 30 is a reflecting surface that reflects a predetermined range (for example, a relatively high-intensity luminous flux in the range indicated by θ in FIG. 2) of the light emitted from the semiconductor light source 20, and emits light from the LED light source 20. The LED light source 20 (the light emitting surface thereof) is disposed in front of the surface. The first reflecting surface 30 is, for example, a spheroid reflecting surface in which the first focal point F1 is set near the LED light source 20 and the second focal point F2 is set near the focal point F of the condenser lens 10.

  As shown in FIG. 2, the first reflecting surface 30 reflects the light emitted from the LED light source 20, collects it at the second focal point, and then transmits the condensing lens 10 to irradiate the front of the vehicle. As shown in FIG. 3, a basic light distribution pattern P1 having a cut-off line L1 defined by the edge 51 of the second reflecting surface 50 (the edge 41 of the shade 40) is formed.

  The shade 40 is a member for blocking a part of the reflected light from the first reflecting surface 30 to form the cut-off line L1 as described above, and has an edge 41 (an edge on the condenser lens 10 side). It is located in the vicinity of the focal point F of the condenser lens 10 and is disposed in a horizontal posture between the condenser lens 10 and the LED light source 20. The edge 41 of the shade 40 (the edge on the condenser lens 10 side) is curved as shown in FIG. 5 in consideration of the aberration of the condenser lens 10 in order to form a cut-off line that is a light / dark boundary line. It is formed into a shape. On the upper surface of the shade 40, as shown in FIG. 5, along the lamp optical axis AX, one end edge 41 (end edge on the condensing lens 10 side) is substantially opposite the end edge 42 (on the LED light source 20 side). A step portion 43 (inclined surface 43a) extending substantially in the center is formed. A second reflecting surface 50 is provided on the upper surface of the shade 40 by applying a mirror surface treatment such as aluminum vapor deposition or attaching a reflecting surface.

  The second reflecting surface 50 is a reflecting surface that reflects the reflected light from the first reflecting surface 30, and the end edge 51 (the end edge on the condensing lens 10 side) is positioned near the focal point of the condensing lens 10. And it is a plane reflective surface arrange | positioned in the horizontal attitude | position between the condensing lens 10 and the LED light source 20. FIG.

  The second reflecting surface 50 reflects the reflected light from the first reflecting surface 30, transmits the condensing lens 10 and irradiates forward, and as shown in FIG. 4, the edge 41 (second reflecting) of the shade 40 An additional light distribution pattern P2 having a cut-off line L2 defined by the edge 51) of the surface 50 (a cut-off line L2 coinciding with the cut-off line L1) and superimposed on the basic light distribution pattern P1 is formed.

  In the present embodiment, as shown in FIG. 4, the light intensity of a predetermined area A1 (an area on the oncoming vehicle side where a relatively low light intensity is required) in the additional light distribution pattern P2 is set to the surrounding A2 of the predetermined area A1. In order to make it lower than the luminous intensity, as shown in FIGS. 1 and 5, a predetermined region of the second reflecting surface 50 (the reflected light from the first reflecting surface 30 is directed to a predetermined region in the additional light distribution pattern P2). In this recess 52, a third reflecting surface 60 is provided.

  The third reflecting surface 60 is a reflecting surface that reflects the reflected light from the first reflecting surface 30 that is incident on the recess 52 formed in the second reflecting surface 50. For example, the third reflecting surface 60 is an inclined plane, an inclined curved surface, or a plurality of irregularities. Surface.

  By providing, for example, an inclined flat surface or an inclined curved surface (such as an inclined concave curved surface or an inclined convex curved surface) as the third reflective surface 60, the reflected light from the first reflective surface 30 that enters the concave portion 52 as shown in FIG. Is reflected toward a direction (for example, a direction X not incident on the condenser lens 10) other than the predetermined region A1 (for example, a region on the oncoming vehicle side where a relatively low light intensity is required) in the additional light distribution pattern P2. It becomes possible to make it. For this reason, as shown in FIG. 4, the light intensity of a predetermined area A1 (for example, an area on the oncoming vehicle side where a relatively low light intensity is required) in the additional light distribution pattern P2 is set to the circumference A2 of the predetermined area A1. It becomes possible to make it lower than the luminous intensity.

  Further, for example, by providing a plurality of uneven surfaces (for example, a plurality of fine uneven surfaces formed by mesh processing or dimple processing) as the third reflecting surface 60, the light enters the recess 52 as shown in FIG. The reflected light from the first reflecting surface 30 is scattered or diffused in a direction other than a predetermined region A1 (for example, an oncoming vehicle side region where a relatively low light intensity is required) in the additional light distribution pattern P2. It becomes possible. For this reason, as shown in FIG. 4, the light intensity of a predetermined area A1 (for example, an area on the oncoming vehicle side where a relatively low light intensity is required) in the additional light distribution pattern P2 is set to the circumference A2 of the predetermined area A1. It becomes possible to make it lower than the luminous intensity. The reflectance of the third reflecting surface 60 may be the same as the reflectance of the second reflecting surface 50, or may be lower than the reflectance of the second reflecting surface 50.

  In addition, the position and area | region where the predetermined area | region A1 of the low luminous intensity in the additional light distribution pattern P2 is formed by adjusting the formation position and formation area of the recessed part 52 (and 3rd reflective surface 60) in the 2nd reflective surface 50. Can be adjusted. FIG. 4 shows that the concave portion 52 (and the third reflecting surface 60) is formed on the front side of the lamp of the second reflecting surface 50 in order to form the predetermined region A1 with low luminous intensity in the oncoming vehicle side region in the additional light distribution pattern P2. This is an example provided at a predetermined position and a predetermined region on the right side with respect to the optical axis AX of the lamp (that is, a predetermined position and a predetermined region on the left side in the vehicle traveling direction).

  As described above, according to the vehicle headlamp optical unit 100 of the present embodiment, the third reflective surface 60 provided in the concave portion 52 formed in the second reflective surface 50 causes the concave portion 52 to enter the concave portion 52. The incident reflected light from the first reflecting surface 30 is directed in a direction (for example, a condensing lens) other than a predetermined region A1 (for example, an oncoming vehicle side region where relatively low light intensity is required) in the additional light distribution pattern P2. It is possible to reflect in the direction X) where the light does not enter 10.

  For this reason, according to the vehicle headlamp optical unit 100 of the present embodiment, the light intensity of the predetermined area A1 in the additional light distribution pattern P2 (for example, the area on the oncoming vehicle side where a relatively low light intensity is required). Can be made lower than the luminous intensity around the predetermined area A1. That is, according to the vehicle headlamp optical unit 100 of the present embodiment, the additional light distribution pattern P2 formed by the second reflection surface 50 is superimposed on the basic light distribution pattern P1 formed by the first reflection surface 30. The luminous intensity of the predetermined area A1 (for example, the area on the oncoming vehicle side where a relatively low luminous intensity shown in FIG. 8 is required) in the predetermined light distribution pattern formed by the above is set to be greater than the luminous intensity of the surrounding area A2 of the predetermined area A1. It can be reduced. That is, it becomes possible to reduce the dazzling light to the oncoming vehicle.

  Further, according to the vehicle headlamp optical unit 100 of the present embodiment, the third reflecting surface 60 is provided in the recess 52 formed in the second reflecting surface 50, and from the surface of the second reflecting surface 50. Since it does not protrude, the reflected light from the first reflecting surface 30 for forming the basic light distribution pattern P1 is not blocked. For this reason, according to the vehicle headlamp optical unit 100 of the present embodiment, it is possible to form a basic light distribution pattern having a desired light intensity distribution.

  Next, a modified example will be described.

  In the above embodiment, the recess 52 is formed in a predetermined region of the second reflecting surface 50 (a region that reflects the reflected light from the first reflecting surface 30 toward the predetermined region in the additional light distribution pattern P2). Although described, the present invention is not limited to this. For example, instead of the recess 52, an opening is formed in a predetermined region of the second reflecting surface 50 (a region in which reflected light from the first reflecting surface 30 is reflected toward a predetermined region in the additional light distribution pattern P2). Also good.

  In this way, the reflected light from the first reflecting surface 30 incident on the opening passes through the opening, and a predetermined area A1 (for example, a relatively low luminous intensity is required) in the additional light distribution pattern P2. It will head in a direction other than the area on the oncoming vehicle side. For this reason, the light intensity of the predetermined area A1 in the additional light distribution pattern P2 (for example, the area on the oncoming vehicle side where a relatively low light intensity is required) can be made lower than the light intensity of the periphery A2 of the predetermined area A1. It becomes possible. That is, it becomes possible to reduce the dazzling light to the oncoming vehicle.

  Alternatively, the predetermined region of the second reflecting surface 50 (the region that reflects the reflected light from the first reflecting surface 30 toward the predetermined region A1 in the additional light distribution pattern P2) is not the recess 52 or the opening but the region. A low reflectance reflecting surface, a scattering reflecting surface, or a diffuse reflecting surface having a reflectance lower than the surrounding reflectance may be formed.

  If it does in this way, the 1st reflection which injects into the predetermined area (area which reflects reflected light from the 1st reflective surface 30 toward predetermined area A1 in additional light distribution pattern P2) of the 2nd reflective surface 50. The reflected light from the surface 30 is reflected by the low reflectance reflecting surface, the scattering reflecting surface, or the diffuse reflecting surface, and the predetermined area A1 in the additional light distribution pattern P2 (for example, the oncoming vehicle side where a relatively low light intensity is required) Direction). For this reason, the light intensity of the predetermined area A1 in the additional light distribution pattern P2 (for example, the area on the oncoming vehicle side where a relatively low light intensity is required) can be made lower than the light intensity of the periphery A2 of the predetermined area A1. It becomes possible. That is, it becomes possible to reduce the dazzling light to the oncoming vehicle.

  In the above embodiment, the first reflecting surface 30 is described as a spheroid reflecting surface, but the present invention is not limited to this. For example, the first reflecting surface 30 may be a reflecting surface having a free-form surface other than the spheroid system.

  Moreover, although the 3rd reflective surface 60 demonstrated in the said embodiment that it was an inclined plane, an inclined curved surface, or several uneven | corrugated surface, this invention is not limited to this. For example, the third reflective surface 60 may be a reflective surface in which a plurality of cuts (unevenness) extending in the lamp optical axis AX direction are formed, as shown in FIG. If a reflective surface in which a plurality of cuts are formed is used as the third reflective surface 60, the reflected light from the first reflective surface 30 is converted into a predetermined region A1 in the additional light distribution pattern P2 (for example, a relatively low light intensity is required). It is possible to scatter or diffuse in a direction other than the oncoming vehicle side area. For this reason, the light intensity of the predetermined area A1 in the additional light distribution pattern P2 (for example, the area on the oncoming vehicle side where a relatively low light intensity is required) can be made lower than the light intensity of the periphery A2 of the predetermined area A1. It becomes possible. In addition, it is possible to improve the connection of the light intensity distribution (for example, to make the boundary between the low light intensity region A1 and its surrounding A2 shown in FIG. 4 inconspicuous).

  The above embodiment is merely an example in all respects. The present invention is not construed as being limited to these descriptions. The present invention can be implemented in various other forms without departing from the spirit or main features thereof.

It is a perspective view for demonstrating the main structures of the optical unit for vehicle headlamps of this embodiment. It is a side view of the optical unit for vehicle headlamps shown in FIG. It is an example of the light distribution pattern P1 formed by the 1st reflective surface 30. It is an example of the light distribution pattern obtained as a result of superimposing the light distribution pattern P2 formed of the 2nd reflective surface 50 on the light distribution pattern P1 shown in FIG. It is an example of the 2nd reflective surface 50 applied to the optical unit for vehicle headlamps of this embodiment. It is a modification of the 2nd reflective surface 50 applied to the optical unit for vehicle headlamps of this embodiment. It is a side view for demonstrating the vehicle lamp described in patent document 1. FIG. It is a figure for demonstrating the area | region where the low luminous intensity is requested | required in a light distribution pattern.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Condensing lens, 20 ... LED light source, 30 ... 1st reflective surface, 40 ... Shade, 41 ... End edge, 42 ... End edge, 43 ... Step part, 43a ... Inclined surface, 50 ... 2nd reflective surface, 51 ... End edge, 52 ... Recess, 60 ... Third reflecting surface, 100 ... Vehicle lamp, A1 ... Predetermined area (low intensity area), A2 ... Ambient, AX ... Light axis of lamp, F ... Focus, L1, L2 ... Cut Offline, P1, P2 ... Light distribution pattern

Claims (6)

A first reflecting surface that forms a basic light distribution pattern by reflecting the light from the condensing lens, the LED light source, the light from the LED light source, passing through the condensing lens and irradiating forward, and from the first reflecting surface In a vehicle headlamp optical unit comprising a second reflecting surface that further reflects reflected light, passes through the condenser lens, and irradiates forward to form an additional light distribution pattern that is superimposed on the basic light distribution pattern.
A recess is formed in a region of the second reflecting surface that reflects reflected light from the first reflecting surface toward a predetermined region in the additional light distribution pattern,
An optical unit for vehicle headlamps, characterized in that a third reflecting surface for reflecting the reflected light from the first reflecting surface incident on the recessed portion is provided in the recessed portion.   The optical unit for vehicle headlamps according to claim 1, wherein the third reflecting surface is any one of an inclined plane, an inclined curved surface, and a plurality of uneven surfaces. The first reflecting surface is a spheroid reflecting surface in which a first focal point is set near the LED light source and a second focal point is set near the focal point of the condenser lens;
The second reflecting surface is a planar reflecting surface having an edge positioned near the focal point of the condenser lens and disposed in a horizontal posture between the condenser lens and the LED light source. The vehicle headlamp optical unit according to claim 1 or 2.   4. The vehicle headlamp optical unit according to claim 1, wherein a reflectance of the third reflecting surface is set lower than a reflectance of the second reflecting surface. 5. A first reflecting surface that forms a basic light distribution pattern by reflecting the light from the condensing lens, the LED light source, the light from the LED light source, passing through the condensing lens and irradiating forward, and from the first reflecting surface In a vehicular lamp provided with a second reflecting surface that forms an additional light distribution pattern that is reflected by reflected light, transmitted through the condensing lens, and irradiated forward, and superimposed on the basic light distribution pattern,
For allowing the reflected light from the first reflecting surface to pass through a region of the second reflecting surface that reflects the reflected light from the first reflecting surface toward a predetermined region in the additional light distribution pattern. An optical unit for a vehicle headlamp, wherein an opening is formed. A first reflecting surface that forms a basic light distribution pattern by reflecting the light from the condensing lens, the LED light source, the light from the LED light source, passing through the condensing lens and irradiating forward, and from the first reflecting surface In a vehicular lamp provided with a second reflecting surface that forms an additional light distribution pattern that is reflected by reflected light, transmitted through the condensing lens, and irradiated forward, and superimposed on the basic light distribution pattern,
Of the second reflecting surface, a reflecting surface having a reflectance lower than the reflectance around the region is reflected in a region that reflects the reflected light from the first reflecting surface toward a predetermined region in the additional light distribution pattern. An optical unit for vehicle headlamps provided with a scattering reflection surface or a diffuse reflection surface.

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